. Author manuscript; available in PMC: 2014 Jun 9.

Published in final edited form as: J Occup Environ Med. 2011 Sep;53(9):975–980. doi: 10.1097/JOM.0b013e3182305282

TABLE 2.

Indices of Sleep-Disordered Breathing, Sleep Quality, and Epworth Sleepiness Scale, Unadjusted and Adjusted for Age, Body Mass Index, Smoking Status, and Alcohol Use

Variable	Unadjusted Means		P^*	Adjusted Means		P
Variable	WTCMMTP	Control	P^*	WTCMMTP	Control	P
AHI	22.7 (14.8, 30.5)	43.4 (35.5, 51.2)	0.0004	27.2 (17.0, 37.4)	48.5 (38.7, 58.3)	0.0002
REM AHI (n = 81)	28.7 (20.1, 37.4)	43.7 (34.5, 53.0)	0.021	33.7 (21.9, 45.4)	51.4 (39.7, 63.2)	0.0068
Supine AHI (n = 90)	36.0 (25.3, 46.7)	45.3 (35.6, 55.1)	0.20	41.1 (28.0, 54.3)	51.1 (38.8, 63.5)	0.17
Supine AHI/AHI (n = 90)	1.91 (1.45, 2.38)	1.45 (1.02, 1.88)	0.15	1.87 (1.25, 2.49)	1.37 (0.79, 1.95)	0.14
Sleep quality	1.66 (1.44, 1.88)	1.90 (1.68, 2.12)	0.13	1.40 (1.10, 1.69)	1.72 (1.43, 2.00)	0.046
ESS	9.8 (8.2, 11.4)	10.1 (8.5, 11.7)	0.78	11.4 (9.2, 13.5)	11.1 (9.0, 13.2)	0.81

Mean values with range in parenthesis; unless otherwise noted, n = 100. Values in bold are significant values.

P for effect of WTCMMTP vs control from the analysis of covariance model.

AHI, Apnea + Hypopnea Index; ESS, Epworth Sleepiness Score; REM, rapid eye movement sleep; WTCMMTP, World Trade Center Medical Monitoring and Treatment Program.